Plenum improved low rpms stability on my car. I think it does help a bit, but it is not a marginal thing. Still, it is very nicely machined part, looks good and works better than stock part, so - why not. It is a very safe upgrade.

As of power gain - it will hardly do much difference if done alone. If you put new complete sport exhaust with 200 or 100 cell sport cats, complimented by less restricted air filter or aftermarket CAI plus plenum plus software - then you will get some power boost.

 

Actually the test results and Dyno Charts from this thread show that there was no gains at all from the Plenum, alone or with other exhaust/intake mods present on a 997.1C2S.

https://www.6speedonline.com/forums/...ss-plenum.html

 

If you are not accumulating Type 1 overevs as fast as your odometer is advancng, there is no need for you to mod your car since you aren't even using the power that is already available.

Forget the plenum. Just lean out WOT and you'll get better results. It will save you $998.37.


https://www.6speedonline.com/forums/1803119-post71.html

 

In case you meant me (Ken, not Kevin), I had the AWE high flow cats between the X51 headers and PSE mufflers.

 

I heard from a birdy - that thread and dyno chart from AWE was a part of some strange process that also included lawyers and exchange of some legal activities over alternative plenum design, so I would not refer to that thread and those dyno graphs as references to anything. It is a dead horse anyway, that thread.

 

So far I've heard people say the Plenum works and doesn't work. Weird thing with all these people on these forums NO ONE...NOT 1 SINGLE PERSON...has done a independant before and after dyno run....on any mod mentioned on these forums.

 

I appreciate all of the great responses.
Perhaps an intake plenum is not the way to go.
Maybe a super charger is in my future.

 

I don't want to start a big debate here again and I understand the feelings expressed by many. The simple fact is, there are many products on the market - some are scrutinized more than others. RSS doesn't own the IPD Plenum brand, however it is part of our catalog of thousands of products because of it's positive attributes. I was the biggest skeptic out there before and even after coming to work for RSS. The simple fact is, it will enhance the driving experience by offering improved throttle response, improved acceleration and offer HP/TQ gains. We have enthusiasts and tuners around the world that swear by this product along with many Porsche dealerships that sell performance parts. RSS offers a 30 day, 100% money back guarantee on this and many of the products we sell. The plenum design has been improved over the years and I personally run them on many of my N/A and Turbo Pcars with positive results. This year, we will be conducting time trial tests and Vbox runs to add to the collective data. Since this is a patented design, not allowing many competitors to create something similar, I fully understand that many would like to debunk this product. Numerous companies have tried to create something similar and this is going on even today. It's quite simple, if you would like to try it as many have - you have a 30 day no risk evaluation to try it with your car's setup and feel the benefits, if you don't have a desire to try it - don't try it. We will always stand behind the products we sell and offer unsurpassed customer service to all of our customers - that is what it's all about.

 

Yes, those types of rumors are necessary to attempt to invalidate an otherwise valid test. Like I said in many other posts about the plenum; at best, any power gained is a result of leaning out the engine, and nothing more. If you're looking to make gains running a leaner engine, you can accomplish that with a 50 cent resistor.

Isn't it amazing how good marketing can make something that is untrue, believable and eventually a fact?

 

All I can say - if it is possible for 50 cent resistor to make same effect I suggest you should start your own company and start selling those resistors for $1K.

From air flow perspective I can say - ipd plenum looks better than stock part. If combined with forced induction I think it should provide even more accented benefit. If you do not believe into any of this this - construct simple test with water pipes and try several designs of T junction to see how it effects flow dynamics, it is mid school grade basic physics.

 

Not everything is rocket science. But, since you brought up physics, please expain exacty what the plenum does to increase the power of your engine by more than 5%.

Are you aware that the the Porsche NA engines include forced induction at certain speeds, right from the factory? A simple way to improve VE.

Furthermore, the shape and design of the intake on a forced induction engine is far less important than it is on an NA engine.


As for the resistor, If you want to spend $1,000 on a 50 cent mod, feel free to send me a check and I'll forward the resistor and instructions and quarentee you an additional 20 hp.

 

Dollar/HP i vote turbo.

 

Agreed...IMO!
And I have done it all...headers,plenum,mufflers and high flow cats.Although they may contribute,there is NO substitute for FI!


Stacy

 

Shortly, I'll have the modified Supercharger, with my already inplace RSS/ iPD Plenum, AWE cats, AND the LWFW. Only thing untouched are the headers, so may want to change to either x51 or something custom that are longer and of equal length.
CATTMAN

 

He means pipes length before junction point. Based on common opinions X51 headers are good enough for 'S' car.

What I really liked was that M&M exhaust from GT3 race car shown in other thread -



That is what I would install on my car if I could. Looks pretty perfect to me from flow design perspective.